KR20160049203A - Device and method for controlling engine braking force - Google Patents

Abstract

The present invention relates to a device and a method for controlling engine braking force for a vehicle, allowing engine braking force as resistance force generated when an engine performs a suction operation to be used by adjusting the degree of opening and closing of a throttle valve in accordance with the degree of the will of a driver as well as the braking force of a friction brake device. According to the present invention, when the driver pushes a brake pedal to operate the friction brake device, oil pressure in the master cylinder of the friction brake device is detected by a pressure sensor of an electronic stability control (ESC) and is allowed to be used to obtain engine braking force by automatically controlling the degree of opening and closing of the throttle valve such that braking is achieved by a combination of the braking force of the friction brake device and the engine braking force, thereby improving braking efficiency. The operation load of the friction brake device is reduced to achieve reduction of each size of a disc, a frictional material or the like of the friction brake device.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an apparatus and a method for controlling an engine brake force,

The present invention relates to an apparatus and method for controlling an engine braking force for an automotive vehicle, and more particularly, to an apparatus and method for controlling a braking force of an engine, And more particularly, to an apparatus and method for controlling engine braking force for an automobile.

Generally, when maintaining the inter-vehicle distance during running of a vehicle, when descending a downward ramp, and when confronted with an unexpected or unexpected situation, the brake pedal is depressed to generate a braking force in order to reduce the speed of the vehicle.

At this time, a conventional friction brake device that generates a braking force when the driver presses the brake pedal generates braking force due to friction between the brake disk and the friction material. Therefore, wear of the friction material due to frictional heat and vapor lock phenomenon of the brake fluid There is a disadvantage that it occurs.

Accordingly, when the vehicle is developed, the weight of the disk and the cost increase are increased by increasing the brake size and ensuring the heat capacity of the disk (friction material abrasion and the temperature limitation of the disk for preventing the disk from being deformed).

Therefore, it is preferable to avoid sudden braking, frequent braking, etc., in accordance with the driver's driving habit, and to use the engine brakes together.

The engine brake is not a so-called brake as a braking device but refers to obtaining a braking force by using a compression pressure of the engine.

In other words, the engine brake means that the braking force can be obtained even when the brake pedal is not used by switching the meshing of the internal gear of the transmission from the high-speed running mode to the low-speed running mode.

Such an engine brake can be usefully used for priority deceleration because an accident such as rollover of the vehicle may occur when the driver suddenly presses the brake pedal when the steel plate travels.

[0003] On the other hand, as a kind of safety device for obtaining a braking force of a vehicle in addition to a normal friction brake device and engine braking force, there are an ABS (anti-lock brake system) for preventing the wheel from being locked at the time of sudden braking, And ESC (electronic stability control) for individually controlling the braking force of each wheel are mounted on the vehicle.

The ABS and the ESC automatically braking force at the time of sudden braking or turning, but it is preferable that the braking force by the brake pedal and the engine braking force are suitably used in parallel at the time of normal driving.

However, there is a problem that it is not easy to perform an operation of obtaining the braking force by stepping on the brake pedal from the driver's position and obtaining the braking force by using the engine brake.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide a brake control apparatus and a brake control method for a brake control apparatus, The braking force can be braked by the sum of the braking force and the engine braking force of the frictional braking device so that the braking force can be improved and the operating load of the frictional braking device can be reduced And an object of the present invention is to provide an apparatus and method for controlling engine braking force for an automobile which can reduce the size of a disc and a friction material of a friction brake apparatus.

According to an aspect of the present invention, there is provided a hydraulic brake system comprising: a master cylinder for generating hydraulic pressure for braking a brake pedal; A pressure sensor for sensing the pressure when the hydraulic pressure of the master cylinder is generated; A throttle valve controller for adjusting the opening and closing amount of the throttle valve for each sensing pressure of the pressure sensing sensor so as to generate the engine braking force together with the frictional braking force; And a controller for controlling the engine braking force of the vehicle.

In addition, the engine brake force control apparatus of the present invention further includes a pedal stroke detection sensor for detecting a stroke when the brake pedal is depressed and transmitting the sensed stroke to the throttle valve controller.

According to another aspect of the present invention, there is provided a method of controlling a brake pedal, comprising: sensing a pressure of a braking hydraulic pressure generated in a master cylinder when the brake pedal is depressed; Adjusting an opening and closing amount of the throttle valve for each detected pressure to generate an engine braking force; Braking the vehicle by the sum of the frictional braking force of the frictional braking device and the engine braking force; The present invention provides an engine brake force control method for an automotive vehicle.

In another embodiment of the present invention, the throttle opening and closing amount is adjusted so that the engine braking force is generated at a level proportional to the frictional braking force.

According to another aspect of the present invention, there is provided a method of detecting a pedal stroke, comprising: sensing a pedal stroke when the brake pedal is depressed; Controlling an amount of opening and closing of the throttle valve for each detected pedal stroke to generate an engine braking force; Braking the vehicle by the sum of the frictional braking force of the frictional braking device and the engine braking force; The present invention provides an engine brake force control method for an automotive vehicle.

In another embodiment of the present invention, the engine brake force is generated by adjusting the opening and closing amount of the throttle valve in the invalid stroke period of the pedal stroke.

Through the above-mentioned means for solving the problems, the present invention provides the following effects.

First, the driver can obtain the braking force of the friction brake device by stepping on the brake pedal, and at the same time, the amount of opening and closing of the stay valve corresponding to the driver's braking effort can be automatically adjusted to obtain the engine braking force, So that the braking force can be improved.

Second, since the engine brake force is automatically obtained when the friction brake device is operated, the operating load of the friction brake can be reduced by the engine brake force.

Third, it is possible to reduce the size of the disk and the friction material according to the reduction of the operating load of the friction brake device, thereby reducing the weight and reducing the cost.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a control block diagram showing an engine brake force control apparatus for a vehicle according to the present invention;
2 is a flowchart showing a method for controlling engine brake force for an automobile according to an embodiment of the present invention,
3 is a graph showing the braking force of the vehicle when applying the engine brake force control method for an automobile according to the embodiment of the present invention,
4 is a flowchart showing a method for controlling an engine brake force for an automobile according to another embodiment of the present invention.
5 is a graph showing the braking force of the vehicle when the engine brake force control method for an automobile according to another embodiment of the present invention is applied.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The present invention is characterized in that the engine braking force is generated in addition to the braking force of the friction brake device operated when the driver depresses the brake pedal so that the total braking of the vehicle can be made of the sum of the braking force of the friction brake and the engine braking force, .

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a control block diagram showing an engine brake force control apparatus for a vehicle according to the present invention; FIG.

1, reference numeral 10 denotes a master cylinder which generates hydraulic pressure for braking when the driver depresses the brake pedal.

When the master cylinder 10 generates a hydraulic pressure for braking when the brake pedal is depressed, the pressure sensor 12 senses the pressure when the hydraulic pressure of the master cylinder 10 is generated.

It is preferable to use an ESC pressure sensor that separately controls the braking force of each wheel without additionally mounting the pressure sensing sensor 12 separately.

The pressure sensor 12 senses the pressure when the braking oil pressure of the master cylinder 10 is generated and transmits the sensed pressure to the throttle valve controller 16 using CAN communication.

The throttle valve controller 16 is for controlling the amount of opening and closing of the throttle valve for regulating the amount of intake air to the engine and substantially controls the amount of driving of the actuator for opening and closing the throttle valve.

Accordingly, the throttle valve controller 16 controls the amount of opening and closing of the throttle valve 20 for each pressure sensed by the pressure sensor 12, and the vehicle obtains the engine braking force.

For example, the opening / closing angle of the throttle valve 20 is controlled to be decreased for each pressure sensed by the pressure sensor 12, thereby generating an engine braking force while reducing the intake air amount to the engine.

Therefore, when the driver depresses the brake pedal, the total braking of the vehicle is made up of the sum of the braking force generated in the normal friction brake apparatus and the engine brake force in accordance with the throttle valve opening / closing amount adjustment as described above.

On the other hand, the engine brake force control apparatus of the present invention further includes a pedal stroke detection sensor 18 for detecting a stroke when the brake pedal is depressed and transmitting it to the throttle valve controller 16.

Therefore, the pedal stroke sensor 18 senses the amount of stroke deformation when the driver depresses the brake pedal, and adjusts the opening / closing angle of the throttle valve 20 in the throttle valve controller 16 using the detected stroke deformation amount , The engine braking force can be generated while decreasing the opening and closing angles of the throttle valve 20 in the invalid stroke period of the stroke amount of deformation, by reducing the intake amount to the engine.

Hereinafter, embodiments of the engine braking force control method of the present invention based on the above-described configuration will be described.

First Embodiment

FIG. 2 is a flowchart illustrating an engine brake force control method for a vehicle according to an embodiment of the present invention. FIG. 3 is a flowchart illustrating a method for controlling an engine braking force for a vehicle according to an embodiment of the present invention. FIG.

First, when the driver depresses the brake pedal, the pressure of the braking oil pressure generated in the master cylinder 10 is detected by the pressure sensor 12, that is, the pressure sensor of the ESC.

Subsequently, the pressure signal sensed by the pressure sensor 12, that is, the pressure signal generated when the braking hydraulic pressure of the master cylinder 10 is generated, is transmitted to the throttle valve controller 16 using CAN communication.

Next, the amount of opening and closing of the throttle valve 20 is adjusted by controlling the amount of drive of the actuator for opening and closing the throttle valve for each pressure sensed by the pressure sensor 12 in the throttle valve controller 16.

At this time, the open / close angle of the throttle valve 20 is controlled to be decreased for each pressure sensed by the pressure sensor 12, so that the engine braking force is generated while the intake air amount to the engine decreases.

Therefore, when the driver depresses the brake pedal, the total braking of the vehicle is made up of the sum of the braking force generated in the ordinary friction brake apparatus and the engine brake force in accordance with the throttle valve opening / closing amount adjustment as described above.

3, the opening / closing amount of the throttle valve is controlled to be decreased according to the pressure sensed by the pressure sensor 12 so that the engine braking force is reduced and controlled to a level proportional to the frictional braking force, The braking force can be used, and as a result, the braking force is obtained by the sum of the braking force of the friction braking device and the engine braking force, so that the braking force can be improved.

Second Embodiment

FIG. 4 is a flowchart illustrating an engine brake force control method for an automobile according to another embodiment of the present invention. FIG. 5 is a flowchart illustrating a method of controlling an engine braking force for a vehicle according to another embodiment of the present invention. FIG.

First, when the driver depresses the brake pedal, the pedal stroke detection sensor 18 mounted on the rear portion of the brake pedal detects the amount of deformation of the pedal stroke of the brake pedal.

At this time, when the brake pedal is depressed, the pedal stroke deformation amount includes an invalid stroke section corresponding to the pedal clearance in addition to the pedal stroke section that generates the hydraulic pressure for braking the actual master cylinder.

Next, the deformation amount signal of the pedal stroke sensed by the pedal stroke detection sensor 18 is transmitted to the throttle valve controller 16 using CAN communication.

Then, the throttle valve controller 16 adjusts the amount of opening and closing of the throttle valve 20 by controlling the amount of drive of the actuator for the opening and closing operation of the throttle valve by the invalid stroke interval of the deformation amount of the pedal stroke.

At this time, the open / close angle of the throttle valve 20 is controlled to decrease by the invalid stroke section, and the engine braking force is generated while the intake air amount to the engine decreases.

Therefore, when the driver depresses the brake pedal, the total braking of the vehicle is made up of the sum of the braking force generated in the ordinary friction brake apparatus and the engine brake force in accordance with the throttle valve opening / closing amount adjustment as described above.

5, the amount of opening and closing of the throttle valve 20 is reduced by an amount corresponding to the invalid stroke range of the brake pedal, so that an additional engine braking force is obtained in addition to the frictional braking force. Consequently, the braking force of the friction brake device and the engine braking force So that the braking force can be improved.

10: Master cylinder
12: Pressure sensor
16: Throttle valve controller
18: Pedal stroke detection sensor
20: Throttle valve

Claims (6)

A master cylinder for generating hydraulic pressure for braking when the brake pedal is depressed;
A pressure sensor for sensing the pressure when the hydraulic pressure of the master cylinder is generated;
A throttle valve controller for adjusting the opening and closing amount of the throttle valve for each sensing pressure of the pressure sensing sensor so as to generate the engine braking force together with the frictional braking force;
And an engine braking force control device for an automobile.
The method according to claim 1,
Further comprising a pedal stroke detection sensor for detecting a stroke when the brake pedal is depressed and transmitting the sensed stroke to the throttle valve controller.
Sensing the pressure of the braking hydraulic pressure generated in the master cylinder when the brake pedal is depressed;
Controlling an amount of opening and closing of the throttle valve for each detected pressure to generate an engine braking force;
Braking the vehicle by the sum of the frictional braking force of the frictional braking device and the engine braking force;
And a control unit for controlling the engine brake force.
The method of claim 3,
Wherein the amount of opening and closing of the throttle valve is adjusted so that the engine braking force is generated at a level proportional to the frictional braking force.
Sensing a pedal stroke when the brake pedal is depressed;
Generating an engine braking force by adjusting an amount of opening and closing of the throttle valve for each detected pedal stroke;
Braking the vehicle by the sum of the frictional braking force of the frictional braking device and the engine braking force;
And a control unit for controlling the engine brake force.
The method of claim 5,
Wherein an engine braking force is generated by adjusting an amount of opening and closing of a throttle valve in an invalid stroke range of the pedal stroke.

Images